| Flutter Windows Embedder |

flutter_engine.cc
Go to the documentation of this file.
1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "include/flutter/flutter_engine.h"
6
7 #include <algorithm>
8 #include <iostream>
9
10 #include "binary_messenger_impl.h"
11
12 namespace flutter {
13
14 FlutterEngine::FlutterEngine(const DartProject& project) {
15 FlutterDesktopEngineProperties c_engine_properties = {};
16 c_engine_properties.assets_path = project.assets_path().c_str();
17 c_engine_properties.icu_data_path = project.icu_data_path().c_str();
18 c_engine_properties.aot_library_path = project.aot_library_path().c_str();
19 c_engine_properties.dart_entrypoint = project.dart_entrypoint().c_str();
20
21 const std::vector<std::string>& entrypoint_args =
22 project.dart_entrypoint_arguments();
23 std::vector<const char*> entrypoint_argv;
24 std::transform(
25 entrypoint_args.begin(), entrypoint_args.end(),
26 std::back_inserter(entrypoint_argv),
27 [](const std::string& arg) -> const char* { return arg.c_str(); });
28
29 c_engine_properties.dart_entrypoint_argc =
30 static_cast<int>(entrypoint_argv.size());
31 c_engine_properties.dart_entrypoint_argv =
32 entrypoint_argv.empty() ? nullptr : entrypoint_argv.data();
33
34 engine_ = FlutterDesktopEngineCreate(&c_engine_properties);
35
36 auto core_messenger = FlutterDesktopEngineGetMessenger(engine_);
37 messenger_ = std::make_unique<BinaryMessengerImpl>(core_messenger);
38 }
39
40 FlutterEngine::~FlutterEngine() {
41 ShutDown();
42 }
43
44 bool FlutterEngine::Run() {
45 return Run(nullptr);
46 }
47
48 bool FlutterEngine::Run(const char* entry_point) {
49 if (!engine_) {
50 std::cerr << "Cannot run an engine that failed creation." << std::endl;
51 return false;
52 }
53 if (has_been_run_) {
54 std::cerr << "Cannot run an engine more than once." << std::endl;
55 return false;
56 }
57 bool run_succeeded = FlutterDesktopEngineRun(engine_, entry_point);
58 if (!run_succeeded) {
59 std::cerr << "Failed to start engine." << std::endl;
60 }
61 has_been_run_ = true;
62 return run_succeeded;
63 }
64
65 void FlutterEngine::ShutDown() {
66 if (engine_ && owns_engine_) {
67 FlutterDesktopEngineDestroy(engine_);
68 }
69 engine_ = nullptr;
70 }
71
72 std::chrono::nanoseconds FlutterEngine::ProcessMessages() {
73 return std::chrono::nanoseconds(FlutterDesktopEngineProcessMessages(engine_));
74 }
75
76 void FlutterEngine::ReloadSystemFonts() {
77 FlutterDesktopEngineReloadSystemFonts(engine_);
78 }
79
80 FlutterDesktopPluginRegistrarRef FlutterEngine::GetRegistrarForPlugin(
81 const std::string& plugin_name) {
82 if (!engine_) {
83 std::cerr << "Cannot get plugin registrar on an engine that isn't running; "
84 "call Run first."
85 << std::endl;
86 return nullptr;
87 }
88 return FlutterDesktopEngineGetPluginRegistrar(engine_, plugin_name.c_str());
89 }
90
91 void FlutterEngine::SetNextFrameCallback(std::function<void()> callback) {
92 next_frame_callback_ = std::move(callback);
93 FlutterDesktopEngineSetNextFrameCallback(
94 engine_,
95 [](void* user_data) {
96 FlutterEngine* self = static_cast<FlutterEngine*>(user_data);
97 self->next_frame_callback_();
98 self->next_frame_callback_ = nullptr;
99 },
100 this);
101 }
102
103 std::optional<LRESULT> FlutterEngine::ProcessExternalWindowMessage(
104 HWND hwnd,
105 UINT message,
106 WPARAM wparam,
107 LPARAM lparam) {
108 LRESULT result;
109 if (FlutterDesktopEngineProcessExternalWindowMessage(
110 engine_, hwnd, message, wparam, lparam, &result)) {
111 return result;
112 }
113 return std::nullopt;
114 }
115
116 FlutterDesktopEngineRef FlutterEngine::RelinquishEngine() {
117 owns_engine_ = false;
118 return engine_;
119 }
120
121 } // namespace flutter
FlutterDesktopEngineProperties::aot_library_path
const wchar_t * aot_library_path
Definition: flutter_windows.h:51
FlutterDesktopEngineGetMessenger
FlutterDesktopMessengerRef FlutterDesktopEngineGetMessenger(FlutterDesktopEngineRef engine)
Definition: flutter_windows.cc:172
FlutterDesktopEngineProperties
Definition: flutter_windows.h:36
flutter::FlutterEngine
Definition: flutter_engine.h:28
flutter::DartProject
Definition: dart_project.h:14
flutter::FlutterEngine::SetNextFrameCallback
void SetNextFrameCallback(std::function< void()> callback)
Definition: flutter_engine.cc:91
user_data
void * user_data
Definition: flutter_windows_view_unittests.cc:47
FlutterDesktopEngineProperties::dart_entrypoint_argv
const char ** dart_entrypoint_argv
Definition: flutter_windows.h:66
FlutterDesktopEngineProperties::icu_data_path
const wchar_t * icu_data_path
Definition: flutter_windows.h:45
FlutterDesktopEngineProcessExternalWindowMessage
bool FlutterDesktopEngineProcessExternalWindowMessage(FlutterDesktopEngineRef engine, HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam, LRESULT *result)
Definition: flutter_windows.cc:210
FlutterDesktopEngineGetPluginRegistrar
FlutterDesktopPluginRegistrarRef FlutterDesktopEngineGetPluginRegistrar(FlutterDesktopEngineRef engine, const char *plugin_name)
Definition: flutter_windows.cc:162
flutter_engine.h
FlutterDesktopEngineProperties::dart_entrypoint
const char * dart_entrypoint
Definition: flutter_windows.h:59
flutter::FlutterEngine::GetRegistrarForPlugin
FlutterDesktopPluginRegistrarRef GetRegistrarForPlugin(const std::string &plugin_name) override
Definition: flutter_engine.cc:80
flutter::FlutterEngine::Run
bool Run()
Definition: flutter_engine.cc:44
FlutterDesktopEngineRef
struct FlutterDesktopEngine * FlutterDesktopEngineRef
Definition: flutter_windows.h:33
flutter::FlutterEngine::ShutDown
void ShutDown()
Definition: flutter_engine.cc:65
flutter::DartProject::dart_entrypoint_arguments
const std::vector< std::string > & dart_entrypoint_arguments() const
Definition: dart_project.h:70
flutter::FlutterEngine::ProcessExternalWindowMessage
std::optional< LRESULT > ProcessExternalWindowMessage(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
Definition: flutter_engine.cc:103
FlutterDesktopEngineProcessMessages
uint64_t FlutterDesktopEngineProcessMessages(FlutterDesktopEngineRef engine)
Definition: flutter_windows.cc:154
flutter::FlutterEngine::~FlutterEngine
virtual ~FlutterEngine()
Definition: flutter_engine.cc:40
binary_messenger_impl.h
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::FlutterEngine::ReloadSystemFonts
void ReloadSystemFonts()
Definition: flutter_engine.cc:76
FlutterDesktopEngineDestroy
bool FlutterDesktopEngineDestroy(FlutterDesktopEngineRef engine_ref)
Definition: flutter_windows.cc:134
FlutterDesktopEngineCreate
FlutterDesktopEngineRef FlutterDesktopEngineCreate(const FlutterDesktopEngineProperties *engine_properties)
Definition: flutter_windows.cc:127
FlutterDesktopEngineProperties::dart_entrypoint_argc
int dart_entrypoint_argc
Definition: flutter_windows.h:62
message
Win32Message message
Definition: keyboard_unittests.cc:137
flutter::DartProject::dart_entrypoint
const std::string & dart_entrypoint() const
Definition: dart_project.h:60
FlutterDesktopEngineSetNextFrameCallback
void FlutterDesktopEngineSetNextFrameCallback(FlutterDesktopEngineRef engine, VoidCallback callback, void *user_data)
Definition: flutter_windows.cc:183
flutter::FlutterEngine::ProcessMessages
std::chrono::nanoseconds ProcessMessages()
Definition: flutter_engine.cc:72
FlutterDesktopEngineProperties::assets_path
const wchar_t * assets_path
Definition: flutter_windows.h:40
FlutterDesktopPluginRegistrar
Definition: window_state.h:31
FlutterDesktopEngineRun
bool FlutterDesktopEngineRun(FlutterDesktopEngineRef engine, const char *entry_point)
Definition: flutter_windows.cc:144
flutter::FlutterEngine::FlutterEngine
FlutterEngine(const DartProject &project)
Definition: flutter_engine.cc:14
FlutterDesktopEngineReloadSystemFonts
void FlutterDesktopEngineReloadSystemFonts(FlutterDesktopEngineRef engine)
Definition: flutter_windows.cc:158
callback
FlutterDesktopBinaryReply callback
Definition: flutter_windows_view_unittests.cc:46